Abstract: RU.00007 : Coffee ring deposition in bands

Authors:

Shreyas Mandre(Brown University)

Ning Wu(Colorado School of Mines)

Joanna Aizenberg(Harvard University)

Lakshminarayanan Mahadevan(Harvard University)

Microscopic particles suspended in a liquid are transported and
deposited at a contact line, as the contact line recedes due to
evaporation. A particle layer of uniform thickness is deposited
if the particle concentration is above a threshold; below this
threshold the deposit forms periodic bands oriented parallel to
the contact line. We present a model for the formation of these
bands based on evaporation leading to the breakup of the thin
liquid film near the contact line. The threshold results from a
competition between evaporation speed and deposition speed. Using
this model, we predict the thickness and length of the bands,
making the control of patterned deposition possible.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.DFD.RU.7